Note that the grant code "TS" is no longer under Agency for Toxic Substances and Disease Registry (ATSDR). It is now under Centers for Disease Control and Prevention (CDC).

For any existing grant number occurrence that expanded only to PHS (Public Health Services), NLM ran an algorithm to discover if any now qualify for one of these new two-letter grant codes. Over 2,000 occurrences were revised to include the fuller expansion that includes a specific office agency.